Peacock feathers can emit laser beams

Scientists have found that dyed peacock feathers can emit laser light, the first known biolaser cavity in animals. The feathers' iridescent colors come from nanostructures called barbules, which act as photonic crystals, tuning specific light wavelengths. This discovery could lead to applications in materials science, such as iridescent windows, self-cleaning surfaces, and anti-counterfeiting measures. It underscores the potential for nature-inspired innovations in optics and photonics.